2-amino-4,6-disalicyloyl-hydrazino-s-triazines

ABSTRACT

1. A COMPOUND OF THE FORMULA   2-(R2-N(-R3)-),4,6-DI(HO-(1,2-PHENYLENE(A))-CO-NH-NH-)-   S-TRIAZINE   WHEREIN R2 AND R3, INDEPENDENTLY OF ONE ANOTHER, IS HYDROGEN, ALKYL OF 1 TO 18 CARBON ATOMS, CYCLOHEXYL, BENZYL, UNSUBSTITUTED PHENYL OR PHENYL SUBSTITUTED BY 1 OR 2 ALKYL GROUPS OF 1 TO 8 CARBON ATOMS, EACH, OR R2 AND R3 CONJOINTLY, WITH THE INCLUSION OF THE NITROGEN ATOM, IS PYRROLIDINO, PIPERIDINO, MORPHOLINO OR HEXAMETHYLENEIMINO RADICALS, AND THE RINGS A ARE UNSUBSTITUTED OR ARE SUBSTITUTED BY 1 OR 2 ALKYL GROUPS OF 1 TO 8 CARBON ATOMS EACH, AN ALKOXY GROUP OF 1 TO 18 CARBON ATOMS OR 1 TO 3 CHLORINE ATOMS.

United States Patent 3,850,918 2-AMINO-4,6-DISALICYLOYL-HYDRAZINO-s- TRIAZINES Helmut Muller, Binningen, Basel-Land, and Siegfried Rosenberger, Riehen, Basel-Stadt, Germany, and Kurt Schwarzenbach, Basel, Switzerland, assignors to Ciba- Geigy Corporation, Ardsley, N.Y.

No Drawing. Filed June 7, 1971, Ser. No. 150,757 Claims priority, application Switzerland, June 17, 1970, 9,182/70; Oct. 2, 1970, 14,666/70 Int. Cl. C07d 87/42 US. Cl. 260-2472 A 6 Claims ABSTRACT OF THE DISCLOSURE New 4,6-disalicyloyl-hydrazino-s-triazines are stabilizers for polyolefines. They are prepared by reacting 4,6-dihydrazino-s-triazines with salicylol chloride.

DETAILED DESCRIPTION The subject of the present invention are new compounds and their use for stabilising polyolefines.

Because of their physical and electrical properties, polyolefines, especially polypropylene, are very suitable for use as an insulating material in the electrical industry, especially for sleeving and coating copper wires, cables and other electrically conducting materials made of copper. Unfortunately, however, the said good properties of the polyolefines are worsened through the fact that in contact with transition metals, especially with copper, the polyolefines suifer an oxidative degradation catalysed by these metals. Additions of copper of less than 1%, for example, already cause an approximately hundred-fold lowering of the stability to oxidation of polypropylene.

In the patent literature, numerous types of compounds have already been described as additives for polyolefines for the purpose of stabilisation in the presence of copper; examples are hydroxybenzoic acid hydrazides or their substitution products. Thus it is known from British Patent Specification 1,093,383 to employ hydroxy-substituted benzoylhydrazides, such as salicylic acid hydrazide. Japanese Patent Specification 18,607/68 describes acylated salicylic acid hydrazides, especially N-acetyl-salicylic acid hydrazide, as additives. Whilst both these types of compounds show a certain effect, polypropylene stabilised therewith is still degraded significantly more rapidly in the presence of copper than is polypropylene which is not in contact with copper. Finally, US. Patent Specification 3,110,696 has disclosed the compound OH HO as a stabiliser against copper. Whilst this compound shows an excellent stabiliser action, it has the disadvantage of an inherent yellow colour, for which reason polyolefine stabilised therewith appears to have an undesirable yellow discolouration.

The same compound, and its nuclear-substituted derivatives, have been described as heat stabilisers for optionally crosslinked polyethylene filled with carbon black. These compounds, however, only show a limited action in polyethylene containing carbon black and are ineflective as heat stabilisers in the absence of carbon black.

It has now surprisingly been found that the new'com pounds of the formula I QFLNHNHJL JQJ or the group R and R independently of one another denote hydrogen, alkyl with 1 to 18 carbon atoms, cyclohexyl, benzyl, unsubstituted phenyl or phenyl substituted by 1 or 2 alkyl groups each having 1 to 8 carbon atoms, or R and R conjointly, with inclusion of the nitrogen atom, denote a saturated S-membered to 7-membered heterocyclic ring, and the rings A are unsubstituted or are substituted by 1 to 2 alkyl groups each having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms and/or 1-3 chlorine atoms, are very suitable for stabilising homopolymeric or copolymeric polyolefines especially against therm'o-oxidative degradation, and that these compounds at the same time possess good colour properties.

The compounds of the formula I protect homopolymeric and copolymeric polyolefines especially against thermooxidative degradation in the presence of transition metals.

At the same time, the compounds according to the invention are not only excellent stabilisers, the action of which, both used alone and in synergistic combinations with other stabilisers, in part distinctly surpasses the previously known classes of compounds described above, but also have the advantage of being colourless. This permits their incorporation into polyolefins without objectionably discolouring the latter. Additionally, all the abovemeutioned previously known compounds show the properties of discolouring polyolefines under ageing conditions, whilst the compounds according to the invention remain largely colourless under these conditions, which represents a great technical advantage for long-term stabilisation.

In formula I, R for example denotes an alkyl group of 1 to 18 carbon atoms, such as: methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl or octadecyl, an alkoxy group with 1 to 18 carbon atoms, such as methoxy, propoxy, butoxy, hexoxy, octoxy, decyloxy, dodecyloxy, hexadecyloxy or octadecyloxy, or a phenyl group which can be substituted by lower alkyl, such as methyl, ethyl, propyl or butyl, by lower alkoxy groups, such as methoxy, ethoxy, propoxy or butoxy, by halogen, such as chlorine or bromine, and by a hydroxyl group, the latter preferably being in the ortho-position.

Inthe description and-in the claims, lower alkyl or alkoxy steers sena kyl 9! a b ou it l to 4 carbon atoms. R can be an unsubstituted, monosubstituted or disubstituted amino group, wherein the substituent or substituents can be unbranched or branched alkyl with 1 to 18 carbon atoms, for example methyl, ethyl, propyl, isopropyl, butyl, tert.-butyl, pentyl, hexyl, octyl, tert.-octyl, decyl, dodccyl, tetradecyl, hexad'ecyl or octadecyl. If R is a phenyl substituted by 1 or 2 alkyl groups, the alkyl groups containl to 8 carbon atoms and are, for example, methyl, ethyl, propyl, butyl, isobutyl, amyl, hexyl, octyl or isooctyl. R can also be a five-membered to sevenmembered heterocyclic group containing nitrogen in the nucleus, which is bonded via a nitrogen atom to the triazine ring of the compound of the formula I, for example the piperidine, or the morpholine group. The nuclei A in the formula I can be substituted, for example by one or two identical or different alkyl groups of 1 to 18 carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, ter t.,- butyl, pentyl, hexyl, octyl, tert.-octyl, decyl, dod'ecyl, t 'adecyLhexadecyl and octadecyl, or an alkoxy group l 'fo '18 carbon atoms, such as methoxy, propoxy, buto'xygheitoxy, decyloxy, dodecyloxy, hexadecyloxy or octadecyloxy.

Preferred metal deactivators amongst the compounds of the formula I are those in which R, denotes an alkyl group with 1 to 3 carbon atoms, an alkoxy group with 2 to 4, especially 3 and 4, carbon atoms, or the group wherein R and R independently of one another are hydrogen, alkyl with 1 to 8 carbon atoms, cyclohexyl, benzyl or phenyl, or R and R with inclusion of the nitrogen atom, form the radical of pyrrolidine, piperidine, morpholine or hexamethyleneimine, and R and R together contain 1 to 8 carbon atoms, and R and the substituents of A together contain at most 12 carbon atoms.

Compounds in which R and R independently of one another denote hydrogen, alkyl with 1 to 8 carbon atoms or phenyl, and R and R together contain 1 to 8 carbon atoms, are particularly preferred.

Preferred antioxidants amongst the compounds of the formula I are those in which R denotes hydrogen, alkyl with 1 to 4 carbon atoms, alkoxy with 1 to 8 carbon atoms, unsubstituted phenyl, phenyl substituted by methyl groups, methoxy groups, halogen and/or hydroxyl groups, the group NHNH-fi o A l orthe group R and R independently of one another denote alkyl with 1 to 18 carbon atoms, cyclohexyl, benzyl, phenyl or phenyl substituted by 1 or 2 alkyl groups with 1 to 4 carbon atoms each, R and R together, with inclusion of the nitrogen atoms, denote a saturated, 6-membered, heterocyclic ring and R furthermore also denotes hydrogen, and the rings A are unsubstituted or are substituted by 1 to 2 alkyl groups with l to 12 carbon atoms each, an alkoxy group with 1 to 18 carbon atoms and/or chlorine, with R and'the substituents of A together containing at least 13 carbon atoms.

, Particularly preferred compounds are those in which R, denotes alkyl with 1 or 2 carbon atoms, alkoxy with 1 to '4 carbon atoms, unsubstituted phenyl, phenyl substi- 4 7 tuted by 1 or 2 methyl groups, chlorine, methoxy or hydroxy1,.the group H W on -NHNH("3 or the group R and R independently of one another denote alkyl With 1 to 18 carbon atoms, cyclohexyl, bcnzyl or phenyl, or R and R together, with inclusion of the nitrogen atom, denote a piperidine or morpholine ring, and the rings A are unsubstituted or are substituted by 1 to 2 alkyl groups with l to 8 carbon atoms, each, an alkoxy group with 1 to 18 carbon atoms and/or chlorine, with R and the substituents of A together containing at least 13 carbon atoms.

Compounds of the formula I can be manufactured in the following ways:

- (a) Reaction of 1 mol of the compound of the formula II N J NHNH: N

wherein R denotes hydrogen, alkyl with 1 to 18 carbon atoms, alkoxy with 1 to 18 carbon atoms, unsubstituted phenyl, phenyl substituted by lower alkyl groups, lower alkoxy groups, halogen and/ or hydroxyl groups, the group wherein R and R have the meaning given under formula I, or the group -NH-NH with 2, and in the case of R =NHNH 3 mols of a compound of the formula III wherein the nucleus A can be substituted as indicated under formula I.

(b) Reaction of 1 mol of the compound of the formulaIV wherein R denotes hydrogen, alkyl with l to 18 carbon atoms, alkoxy with 1 to 18 carbon atoms, unsubstituted phenyl, phenyl substituted by lower alkylgro'ups, lower wherein R and R have the meaning indicated under formula I, with 2 mols of a compound of the formula V @wommm wherein the nuclei A can be substituted as indicated under formula I, with one mol of an amine of the formula VII R (VII) wherein R and R have the meaning indicated under formula I.

(d) Reaction of 1 mol of cyanuric chloride with 3 mols of a compound of the formula V.

The compounds of the formula II are manufactured from one mol of the compounds of the formula IV and 2 mols of hydrazine, and in this case R in the formula IV has the meaning of R in the formula II.

The compounds of the formula VI are obtained from 1 mol of cyanuric chloride and two mols of the compound of the formula V.

The compounds according to the invention provide protection against thermooxidative degradation for polyolefines, preferably a-olefine polymers, such as polypropylene, optionally crosslinked polyethylene, polyisobutylene, polymethylbutene, polymethylpentene-l, polybutene-l, polyisoprene or polybutadiene; copolymers of the monomers on which the said homopolymers are based, such as ethylene-propylene copolymers, propylenebutene-l copolymers, propylene-iso'butylene copolymers, styrene-butadiene copolymers, ethylene-vinyl acetate copolymers, and terpolymers of ethylene and propylene with a diene, for example hexadiene, dicyclopentadiene or ethylidenenorbornene; and mixtures of the abovementioned homopolymers, for example mixtures of polypropylene and polyethylene, polypropylene and polybutene-l or polypropylene and ,polyisobutylene. Polypropylene, and its mixtures and the copolymers which contain propylene units, are here preferred.

The new compounds are incorporated into the substrates at a concentration of 0.01 to 5.0% by weight, calculated relative to the material to be stabilised.

. Preferably, 0.05 to 1.5, and particularly preferentially 0.1 to 0.8% by weight of the new compounds, calculated relative to the material to be stabilised, are incorporated into the substrates.

The incorporation can take place before, during or preferably after polymerisation, for example by mixing at least one of the compounds of the formula I, and further additives if desired, into the melt in accordance with the methods customary in the art, before or during shaping, or by applying the dissolved or dispersed compounds to the polymer, where appropriate with subsequent evaporation of the solvent.

In the case of crosslinked polyethylene, the compounds are added before the crosslinking.

The following new compounds are, for example, particularly suitable for use as metal deactivators:

The following new compounds are for example particularly suitable for use as antioxidants:

2- octadecylamino -4, 6-disalicyloylhydrazino-s-triazine,

2 di-Z-ethylhexylamino -4, 6-bis- (2-hydroxy-5-tert.-

butylbenzoylhydr azino -s-triazine,

2- (dioctadecylamino) -4,6-bis- (2-hydroxy-5-tert.-

octylb enzoyl-hydrazino -s-triazine,

2-dioctadecylamino-4,6-bis- (2-hydroxy-4 octoxybenzoylhydrazino -s-triazine,

2- di-Z-ethylhexyl-amino) -4, 6-bis- (2-hydroxy-4-butoxybenzoylhydrazino -s-triazine,

2- di-isopropylamino -4,6-bis- (2hydroxy-4-octoxybenzoylhydrazino -s-triazine,

2-propoxy-4, 6-bis- (2-hydroxy-4-oc-toxybenzoylhydrazino -s-triazine, and

compounds of the formula in which X denotes the radicals --OCH1-CH;CH;

As further additives, together with which the stabilisers usable according to the invention can be employed, there may be mentioned:

1. Antioxidants of the aminoaryl and hydroxyaryl series. Amongst the latter, the sterically hindered phenol compounds should be mentioned, for example:

2,2-thiobis-(4-methyl-6-tert.-butylphenol), 4,4-thiobis- 3-methyl-6-tert.-butylphenol) 2,2'-methylene-bis- (4-methyl-6-tert:.-butylphenol 2,2'-methylene-bis-(4-ethyl-6-tert.-butylphenol), 4,4'-methylene-bis- 2-methyl-6-tert.-butylphenol) 4,4-butylidene-bis-(3-methyl-6-tert.-butylphenol) esters of B-4-hydroxy-3,S-di-tert.-butylphenyl-propionic acid with monohydric or polyhydric alcohols, such as methanol, ethanol, octadecanol, hexanediol, nonanediol, trimethylhexanediol, thiodiethylene glycol, trimethylolethane or pentaerythritol,

2,4-bis-octylmercapto-6-(4-hydroxy-3,5-di-tert.-

butylanilino)-s-triazine,

2,4-bis-(4-hydroxy-3,5-di-tert.-butylphenoxy)-6- octylmercapto-s-triazine,

1, l-bis- (4-hydroxy-2-methyl-5-tert.-butyl-phenyl -3- dodecyl-mercapto-butane,

4-hydroxy-3,S-di-tert.-butylbenzyl-phosphonic acid esters,

such as the dimethyl, diethyl or dioctadecyl ester, (3-

methyl-4-hydroxy-5-tert.-butylbenzyl)-malonic acid dioctadecyl ester, s-(3,S-dimethyl-4-hydroxyphenyl)-thioglycollic acid octadecyl ester, and esters of bis-(3,5-ditert.-butyl- 4 hydroxybenzyl)-malonic acid, such as the didode'cyl ester, dioctadecyl ester and 2-dodecylmercapto-ethyl ester.

Amongst the aminoaryl compounds, there should be mentioned aniline and naphthylamine derivatives, and their heterocyclic derivatives, for example, phenyl-lnaphthylamine, phenyl-2-napht-hylamine, N,N'-dipheny'l p-phenylenediamine, N,N' di 2-naphthyl-p-pheny1enediamine, N,N-di-sec.-butyl-p-phenylenediamine, fi-ethoxy- 2,2,4-tnimethyl-1,Z-dihydroquinoline, 6-dodecyl-2,2,4-trimethyl-1,2-dihydroquinoline, monoand di octy'liminodibenzyl, and polymerised 2,2,4-trimethyl-1,2-dihydroquinoline, though on combined use of the compounds of the formula I with the abovementioned amine compounds the stabilised polymer no longer possesses such good colour properties, because of the tendency to discolouration of the abovementioned amine compounds.

2. UV-absorbers and light protection agent-s, such as:

(a) 2 (2'ahydrox'yphenyl)-benztriazoles, for example the 5'-methyl, 3,5'-di-tert.-buty-l, 5-tert.-butyl, S-chloro- 3',5'-di-tert.-butyl, 5-chloro-3'-tert.-butyl, 5'-methyl, 3,5'- di-tert.-amyl, 3'-methyl-S'fl-carbomethoxyethyl and 5- chlono-3',S'-di-tert.-amyl derivative,

(b) 2,4-bis-(2'-hydroxyphenyl)-6-al'kyl s triazines, for example the 6-ethyl or 6-undecy1 derivative,

(c) 2-h'ydroxy-benzophenones, for example the 4-hydroxy, 4-methoxy, 4-octoxy, 4-decyloxy, 4-dodecyloxy, 4, 2',4'-trihydroxy or 2-hydroxy-4,4-dimethoxy derivative,

(d) 1,3-bis-(2'-hydroxy benzoyl)-benzenes, for example 1,3-bis- 2'-hydroxy-4-hexyloxy-benzoyl -benzene, 1, 3-bis- (2-hydroxy-4-octoxy benzoyl) benzene and 1,3- bis- (2'-hydroxy-4-do decyloxy-benzoyl) -b enzene.

'(e) Aryl esters of optionally substituted benzoic acids, such as phenyl salicylate, octylphenyl salicylate, benzoylresorcinol, dibenzoyl resorcinol, 3,5-di-tert.-butyl-4-hydroxybenzo'ic acid 2,4-ditert.-butyl-phenyl ester or octadecyl ester.

q( f) Acrylates, for example a-cyano-pfi-diphenylacrylic acid ethyl ester or isooctyl ester, or carbomethoxy cinnamic acid methyl ester, a-cyano-fi-methyl-p-rnethoxyoinnamic acid methyl ester or butyl ester, and N-(fl-carbometh'oxy-vinyl -2-methylind oline.

(-g) Nickel compounds, for example nickel complexes of 2,2-thiobis-(4-tert.-octylphenol), such as the 1:1 and 1:2 complex, optionally With other ligands such as n-butylamine, nickel complexes of bis-=(4-ter t.-octylphenyl)-sulphone, such as the 2:1 complex, optionaly with other ligands such as 2-ethylcaproic acid, nickel dibutyldithiocarbamate, nickel salts of 4-hydroxy-3,5-di-tert.-butylbenzyl-phophonic acid monoalkyl esters, such as the methyl, ethyl 'or butyl ester, and the nickel complex of 2-hydroxy- 4-phenyl-undecyl-ketone-oxime.

(h) Ox-alic acid diamides, for example 4,4'-di-octyloxy-oxanilide, 2,2'-di-octyloxy-5,5'-di-tert.-butyl-oxanilide and 2,2'-di-dodecyloxy-5,5'-di-tert.-butyl-oxanilide.

3. Phosphi-tes, such as triphenylphosphite, diphenylalkyl-phosphites, phenyldialkylphosphites, trinonylphenylphosphite, tnilaurylphosphite, trioctadecylphosphite, 3,9- di-isodecyloxy-2,3,8,1O tetraoxa 3,9 diphosphaspiro- (5,5 )-undecane and tri-(4-hyd1'oxy-3,5 di tert. butylphenyl)-phosphite.

4. Nucleating agents, such as 4-tert.--butylbenzoic acid, adipic acid and diphenylacetic acid.

5. Compounds which destroy peroxide, such as esters of fl-thiodipropionic acid, for example the lauryl, stearyl, myrystyl or tridecyl ester. Salts of Z-mercaptobenzimidazole, for example the zinc salt, or diphenylthiourea.

6. Other additives, such as pla-sticisers, anti-static agents, fiameproofing agents, blowing agents, pigments, carbon black, asbestos, glass fibres, kaolin and talc.

When using the stabilisers according to the invention in combination with phenolic antioxidants, particularly good stabilising effects are achieved if compounds which destroy peroxides, such as higher alkyl esters of thiodipropionic acid, are used simultaneously, since these compounds which destroy peroxide do not only, as is known, show synergism With the phenolic antioxidants, but also with the stabilisers of the formula I. v

The polyolefines stabilised by addition of the compounds according to the invention are particularly suitable for use as coating material for copper wire-s and cables, but also for use for other types of metal coating and for the manufacture of shaped articles, such as films, fili-ment-s, foils, pipes, injection-moulded articles and the like. They can even be used mixed with copper or pigments'containing copper.

The invention is explained in more detail in the ,Examp'les which follow.

Example 1 OH HO l l (a) 25 g. of hydrazine hydrate in 25 ml. of dioxane are first introduced into the reaction vessel, and are slowly treated with a solution of 24.9 g. of Z-(di-n-propylamino)-4,6-dichloro-s-triazine in ml. of dioxane at approx. 30 (3., Whilst stirring and cooling externally. The reaction mixture is heated to the boil under reflux for 3 hours. On cooling, 2-(di-n-propylamino)-4,6-dihydrazino-s-triazine precipitates as a white, micro-crystalline powder. It is filtered 01f, freed of adhering hydrazine hydrochloride by intensive washing with cold water, and, if desired, further purified by recrystallisation from dioxane. The compound melts at C.

The reaction can also be carried out by only employing 2 mols of hydrazine hydrate per mol of dich'lorotriazine, and binding the hydrogen chloride formed in the reaction by simultaneous addition of 1.8 mols of concentrated sodium hydroxide solution.

(b) 24 g. of 2-(di-n-propylamino)-4,6-dihydr-azino-striazine are dissolved in approx. 300 ml. of dimet'hylacetamide and are treated with 32 g. of salicyloyl chloride at room temperature over the course of 30 minutes. The reaction is exothermic and cooling is therefore necessary. The homogeneous reaction mixture is stirred for a' further 30 minutes at room temperature and is then slowly poured into 500 to 1000 ml. of ice water whilst stirring,

whereupon the reaction product precipitates as a white solid. The product is dissolved in dimethylacetamide, carefully precipitaeed with Water, filtered off, washed with ethanol and subsequently dried at 70 C. 2-(-di-n pro- TABLE 2 Dlhydrazino-s-triazine N N NHzN HkNLNHNHz Melting point of the reaction product A B Q-o ONHNHLNJ-NHNHC o@ R N (C Hz) 2 melting point: 186 C.

Stabiliser No. 5, 296-8 0. (item dimethylformamidelwater).

melting point: 220 C.

Stabiliser N o. 6, 260 C. (from aeetonitrile).

R =NHO H melting point: 260 C.

Stabiliser No. 7, 150 C. (trom acetone/water).

R =NH C3117 melting point: 198 C.

Stabiliser No. 8, 195 C. (from acetonitrile).

R =NH C 1111 melting point: 165 C.

Stabiliser No. 9, 210-2l2 0. (from acetom'trile).

R= C 3H1 melting point: 158 C.

Stabiliser No. 10, 268 0. (from isopropanol).

plyamino) 4,6 di salicyloylhydrazino s triazine (Stabiliser No. 1) is thus obtained in the form of a white, 30

crystalline powder of melting point '254-5 C.

If, in this Example, the salicyloyl chloride is replaced 'by the equimolar amount of one of the acid chlorides 258-260 C. (from dimethylformamide/water) (Stabiliser No. 2).

Acid chloride 275-276 C. (from dimethylformamide/Water) (Stabiliser No. 3).

Example 2 t 20 g. of 2-propoxy-4,G-dihydrazino-s-triazine (melting point 130 C.) are dissolved in 200 ml. of dimethylacetamide and treated with 32 g. of salicyloyl chloride at 'over the course of minutes, whilst stirring and cooling externally. The reaction is exothermic. The homogeneous reaction mixture is stirred for a further 30 minutes at 20 C. and is subsequently clarified by filtration and slowly treated with 500 ml. of water whilst stirring, whereupon the reaction product precipitates as a white solid. The precipitate is filtered oil, washed with water,

dried at 80 C. and purified by recrystallisation from dioxane. The 2-propoxy-4,6-disalicyloylhydrazino-s-triazine obtained (Stabiliser No. 4) has a melting point of 258- 260 C.

If, in this Example, Z-(propoxy)-4,6-dihydrazino-s-triazinc is replaced by the equimolar amount of one of the Example 3 l on HO 21.7 g. of 2-phenyl-4,6-dihydrazino-s-triazine (melting point: 228 C.) are suspended in 200 ml. of dimethylacetamide and 32 g. of salicyloyl chloride are added over the course of 30 minutes at room temperature, whilst stirring and cooling externally. The reaction is exothermic. The homogeneous reaction mixture is stirred for a further 30 minutes at room temperature and is then clarified by filtration and slowly poured into 700 ml. of water, whilst stirring, whereupon the reaction product precipitates as a yellowish-white solid. The precipitate is filtered oif, washed with water, dried at C. and purified by precipitation with water from dimethylacetamide solution, and after drying is optionally still digested with hot acetonitrilc. The resulting 2-phenyl-4,6-disalicyloyl-hydrazino-s-triazine (Stabiliser No. 11) has a melting point of 267-268 C.

If, in this Example, 2-phenyl-4,6-dihydrazino-s-triazine is replaced by the equivalent quantity of one of the dihydrazinotriazines of Table 3 below, and the analogous procedure is followed, the correspondingly 2-substituted disalicyloylhydrazino-s-triazines are obtained, initially in the form of almost white, high-melting crude products, which can be purified by recrystallisation from dimethylformamide/H o or from acetonitrile:

TABLE 3 Melting point, C.

2)-CeH5--- O-11-C4Ha 11 Example 4 NH m N N l l (a) 23.2 g. of 2-anilino-4,6-dihydrazino-s-triazine (melting point: 239) are suspended in 300 ml. of dimethylacetamide and treated with 32 g. of salicyloyl chloride over the course of 30 minutes, at approx. 20 C., whilst stirring and cooling externally. The reaction is exother-- mic. The homogeneous reaction mixture is stirred for a further 30 minutes at 20 C. and is subsequently clarified by filtration and slowly poured into "about 700 ml. of water at 80 C., whilst stirring. Hereupon, the reaction product precipitates as a white solid. After cooling, it is filtered olf, -washed-withwater and dried at approx. 70 C. The 2-anilino-4,6-disalicyloylhydrazino-s-triazine thus obtained (-Stabiliser No. 12) melts at approx. 170, with slow decomposition. If desired, the compound can be further'purified by precipitation with water from dimethylacetamide solution.

v (b)-The same compound is obtained in a somewhat less pure form in the following manner:

- 18.4 g. of cyanuric chloride are dissolved-in 200 ml. of-

methyl ethyl ketone and 30.4 g. of salicylic acid hydrazide and 10.6 g. of anhydrous sodium carbonate are simultaneously added, in portions, at C., whilst stirring and cooling. The reaction mixture is stirred for a further 2 hours at C. and then 9.3 g. of aniline and 10 ml. of 10 N sodium hydroxide solution are added simultaneously at about C. Thereafter the mixture is heated to the boil under reflux for 5 hours, with continued stirring. After cooling, the precipitate is filtered off and washed with water until it is free of salt. If desired, the 2-anilino- 4,6-di-salicyloylhydrazino-s-triazine thus obtained can be further purified by dissolving it in dimethylacetamide and precipitating with water. The substance melts above 170 C., with slow decomposition.

Example 5 OH HO 20.8 g. of 2 propoxy-4,6-dichloro-s-triazine are dissolved in 200 ml. of dimethylacetamide at 20 C. 15.2 g. of salicylic acid hydrazide are added to this solution, whilst stirring, followed by 10 ml. of 10 N sodium hydroxide solution added slowly. The reaction is exothermic and the temperature is kept at 20 C. by external cooling. After minutes, a further 15.2 g. of salicylic acid hydrazide and a further 10 ml. of 10 N sodium hydroxide solution are added. The reaction mixture is then further heated to the boil under reflux for 3 hours. The sodium chloride formed hereupon precipitates. After cooling, the reaction solution is freed of sodium chloride and undissolved impurities by filtration and is poured into 500 ml. of water. Hereupon, the reaction product precipitates as a white solid. After filtering off, the 2-propoxy-4,6disalicyloylhydrazino-s-triazine obtained (Stabiliser No. 4) is washed with water, and the moist filter cake is thoroughly digested with ethanol and finally dried in vacuo at 100. The compound forms white crystals of melting point 256 C.

By way of example, 2-(di-n-propylamino)-4,6-disalicyloylhydrazino-s-triazine (melting point 254 C., Stabiliser N0. 1) and 2-n-propylamino-4,6-disalicyloylhydra- 12 zino-s-triazine of melting point 195 C. (Stabiliser No. 8) are also obtained in the same manner if, in the present example, 2-propoxy-4,6-dichloro-s-triazine is replaced by an equivalent amount of 2 (di-n-propylamino)-4,6-dichloro-s-triazine or 2-n-propylamino-4,fi-dichloro-s-triazine respectively.

Example 6 OH HO N l @CONIINHW FNHNHCO-Q N N HO (a) 34.2 g. of 2,4,6 trihydrazino-s-triazine are suspended in 500 ml. of dimethylacetamide and 93.6 g. of salicyloyl chloride are slowly added at 10-15 C., whilst stirring. After stirring for 1 hours at about 20 C., the reaction mixture forms a fairly homogeneous solution, which is clarified by filtration and allowed to run into 1 litre of cold water. The yellowish precipitate is thoroughly washed with water and the moist filter cake is purified by dissolving it in acetone, clarifying the solution by filtration and precipitating the product with water. A further purification is achieved by reprecipitating from dioxane solution with water.

The 2,4,6 trisalicyloylhydrazino-s-triazine obtained (Stabiliser No.13) is dried in vacuo at about 60 C.,The compound decomposes above 180 C. I

(b) The same compound is also obtainable in the following manner:

18.4 g. of cyanuric chloride are dissolved in 200 ml. of methyl ethyl ketone and 45.6 g. of salicylic acid hydrazide and 30 ml. of 10 N sodium hydroxide solution are simultaneously added in portions, at 5 C., whilst stirring and cooling. Thereafter the reaction mixture is stirred for a further 3 hours at 50 C. and is then allowed to cool to oom temperature and run into 500 ml. of Water. The yellowish-white solid which hereupon precipitates is filtered olf and washed with water. The further purification of the 2,4,6-trisalicyloylhydrazino-s-triazine thus obtained can be carried out as described above.

(a) 25 g. of hydrazine hydrate in 25 ml. of dioxane are first introduced into the reaction vessel and are-slowly treated with a solution of 38.9 g. of 2- (di-[2-ethylhexyl1- amino)-4,6-dichloro-s-triazine in ml. of dioxane-at approx. 30 C., whilst stirring and cooling externally. The reaction mixture is heated to the boil under reflux for 3 hours. On cooling, 2-(di-[2-ethylhexyl]-amino)-4,6-dihydrazino-s-triazine precipitates as a white powder. It is filtered off, washed with cold water and, if desired, further purified by recrystallisation from dioxane.

(b) 38 g. of 2 (di-[2-ethylhexyl]-amino)-4,6-dihydrazino-s-triazine are dissolved in 350* ml. of dimethylacetamide and 32 g. of salicyloyl chloride are added over the course of 30 minutes at room temperature. Thereaction is exothermic. The homogeneous reaction mixture is stirred for a further 30 minutes at room temperature and is then poured into 1000 ml. of ice water whilst stirring, whereupon the reaction product precipitates as a white further 3 hours at 120 C. and cooled. The solution is poured into 1500 ml. of water whilst stirring, whereupon the product precipitates as a whit-e solid. After filtration, it is dried and recrystallised from ethylene glycolmonomethyl ether. 2-(di-octadec-ylamino)-4,6-disalicyloylhydrazino-s-triazine (Stabiliser No. 17) is thus obtained in the form of a white, crystalline powder of melting point 20-201 C.

If, in this Example, the salicylic acid hydrazide is replaced by theequimolar amount of one of the substituted salicylic acid hydrazides of Table 4 below, and an analogous procedure is followed, the corresponding substituted 2 (dioctadecylamino)-4,6-disa1icyloylhydra- TABLE 3 Dihydraziuo-s-triazine Melting point of the reaction product A 0H N N 011 H NHN I NHNH: QC ONHNH- J-NHNHC 0G Stabiliser No. 15, 264 0.

R=-NH--CmH31 Stabiliser No. 16, 89 0:

7 CONHNH kNLNHNHCO (a) 18.5 g. of cyanuric chloride in 50 ml. of chloroform are initially introduced into the reaction vessel and cooled to -5 C. A solution of 52 g. of dioctadecylamine in 200 ml. of chloroform is slowly added dropwise, whilst stirring and cooling externally, and subsequently the mixture is stirred for a further 5 minutes and then treated with a solution of 4.0 g. of sodium hydroxide in ml.

of water. The mixture is stirred for a further hour without external cooling, in the course of which the temperature slowly rises to room temperature. 7 V v i p The chloroform solution is separated from the aqueous phase, repeatedly washed with water, filtered, dried and evaporated. The crystalline residue is 2-(di-octadecylamino)-4,6-dichloro-s-triazine, which melts at 60 C.

(b) 12.2 g. of salicylic acid hydrazine are dissolved in 120 ml. of dimethylacetamide at 60 C. and treated with a. solution of 26.8 g. of 2-(di-octadecylamino)-4,6-dichloro-s-triazine in 120 ml. of dimethylacetamide. The mixture is warmed to 120 C. and kept for 3 hours at this temperature, 1.0 g. of sodium hydroxide in 6 ml. of water is then added dropwise, and the whole is stirred for a zino-s-triazines having the melting points indicated, are obtained:

1,1,3,8-tetramethylbutyl C ON HN Hz Stabiliser No. 20, 22l223 O.

tert.buty1 22.6 g. of 2-hydroxy-4-octoxy-benzhydrazide are dissolved in 200 m1. of dimethylacetamide at 60 C. and treated with a solution of 10 g. of 2-(di-n-propylamino)- 4,6-dichloro-s-triazine in 50 ml. of dimethylacetamide whilst keeping the temperature constant. The reaction mixture is heated to 120 C. over the course of 3 hours. After cooling, it is poured into one litre of water, whereupon the product precipitates as a white solid. After filtration, it is dried and recrystallised froni 'ethylene' glycol-monornethyl ether. 2- (di-n-propylamino -4,6-di- (2 hydroxy 4 octoxybenzoylhydrazino)-s-triazine (Stabiliser No. 21) is thus obtained in the form of a white powder of melting point 195-196 C.

Example 10 solved in 200 ml. of dimethylacetamide at room temperature, and a solution of 8.0 g. of cyanuric chloride in 100 ml. of dimethylacetamide is slowly added. The reaction mixture is warmed to 60 C., 10.4 g. of pyridine in 50 ml. of dimethylacetamide are added dropwise at this temperature, and the temperature is then further raised as far as 90 C. After stirring for 2 hours, the mixture is cooled and poured into one litre of water, whereupon the product precipitates. After filtration, it is dried and recrystallised from ethylene glycol-monomethyl ether. 2,4,6- tri-s-(Z-hydroxy-4-octoxybenzoylhydrazino) 3 triazine (Stabiliser No. 22) is thus obtained in the form of a white powder of melting point 155 C. The preparation thus produced stillcontains about 0.5%iof water.

The previously known stabilisers for polyolefines listed in Table 5 below were also tested as comparison compounds in the test examples which follow:

TABLE 5 Stabiliser No.; Chemical description 23 .N-salicyloyl-hydrazine.

'24 .N-acetyl-N'-salicyloyl-hydrazine.

.N-salicyloyl-N-salicylidene-hydrazine.

Example 11 (a) Manufacture of the test specimens-100 parts of polypropylene (melt index 3.2 g./10 mins., 230 C./ 2160 g.) are thoroughly mixed for 10 minutes, in a shaking apparatus, with 0.1 part of fl-(3,5-di-tert.butyl-4-hydroxyphenyl)-propionic acid octadecyl ester, 0.3 part of dilaurylthiodipropionate and 0.5 part of an additive listed in Table 6 below. v

The resulting mixture is kneaded in a Brabender plastograph at 200 C. for 10 minutes, 1.0% by weight of powdered copper (manufactured electrolytically, Merck) is then added, and the whole is thoroughly mixed at the same temperature for a further 2 minutes. The composition thus obtained is subsequently pressed in a platen press at 260 C. platen temperature to give 1 mm. thick 'sheets, from which strips of 1 cm. width and 17 cm.

length are punched by means of a punch tool.

The fully stabilised test specimens without addition of copper, or with addition of copper but without metal deactivator, which are required for comparison purposes, are manufactured analogously.

(b) Test.-The test for effectiveness of the metal deactivators added to the test strips containing copper is carried out by heat ageing in a circulating air oven at 149 or 135 C., and is compared with test strips which do not contain copper. For this purpose, 3 test strips of each formulation are employed. The incipient, easily visible decomposition of the test strip is defined as the end point.

TABLE 6 [Oven ageing times] Days untll decomposition starts Test tempera- Without With additure, 0. addition 01 tion oi Stabiliser number copper copper Without additive. 149 20 1 135 90 1 Comparison products Days until decompo- The test. specimens Without addition of copper, described in Example 11, were furthermore tested for their colour stability, in particular:

(a) After the incorporation process (Table 7, column 2) (b) After heat ageing at 149 C. (Table 7, column 3) (c) After 1 weeks treatment with boiling water (Table 7,

column 4).

17 For Table 7, an empirical colour scale was used, in which denotes absence of colour, 4 denotes a just perceptible slight discolouration and 3, 2, 1 and 1 denote progressively more intense discolouration.

TABLE 7 [Test for colour stability (without addition of copper)] Colour assessment according to scale 1 to 5 After After heat 100 parts of polypropylene (melt index 3.2 g./ mins., 230 C./2160 g.) are thoroughly mixed for 10 minutes, as described in Example 11, in a shaking apparatus, with 0.5 part of the Stabiliser No. 5 and with the further additives listed in Table 8, in the concentrations indicated.

The resulting mixture is kneaded for 10 minutes in a Brabender plastograph at 200 C., 1.0% by weight of powdered copper (manufactured electrolytically, Merck) is then added, and the whole is thoroughly mixed at the same temperature for a further 2 minutes. The composition thus obtained is subsequently pressed in a platen press, at 260 C. platen temperature, to give 1 mm. thick sheets, from which strips of 1 cm. width and 17 cm. length are punched with the aid of a punch tool.

The fully stabilised test speciments without addition of copper, required for comparison purposes, are manufactured analogously.

The test of the dependence of the action of the Stabiliser No. 5 on the further additives is carried out by heat ageing in a circulating air oven at 149 C. The results are indicated in Table 8, column 3, and the oven ageing times of the test specimens without addition of copper, required for comparison, are indicated in column 2.

TABLE 8 [Oven ageing times at 149 0.]

Days until decomposi- A: 3-(3,5ditert.butyl-4hydr0xypheny1)-propionic acid H- octadecyl ester. h 1,1,3-tris- (3 tert.-buty1-4-hydr0xy-5-1nethylphenyl) utane.

C 1,3,5trimethyl-2A,G-tris-(3,5'-ditert.-buty1-4-hydroxy benzyl) -benzene.

D: Dilauryl-tliiopropionate. I

E 3 (3,5-ditert.-butyl-4-hydroxyphenyl)-propionic acid tetraester of pentaerythritol.

Similar favourable results are obtained if the polypropylene used additionally contains of gas black.

Example 14 100 parts of polypropylene (melt index 3.2 g./l0 mins., 230 C./ 2160 g.) are thoroughly mixed for 10 minutes, in a shaking apparatus, with the additives listed in Table 9, in the concentrations indicated.

The resulting mixture is kneaded for 10 minutesin a Brabender plastograph at 200 C., 0.1% by weight of copper stearate is then added, and the whole is thoroughly mixed at the same temperature for a further 2 minutes. The resulting composition is subsequently pressed in a platen press at 260 C. platen temperature to give 1 mm. thick sheets, from which strips of 1 cm. width and 17 cm. length are punched with the aid of a punch tool.

The stabilised test specimens without added copper stearate, required for comparison purposes, are manufactured analogously.

The test of the efiectiveness of the metal deactivator (Stabiliser No. 5) in the test strips containing copper stearate is carried out by heat ageing in a circulating air oven at 149 C.; for results, see Table 9, column 3. The oven ageing times of the test specimens without added copper stearate, which are required for comparison, are given in Table 9, column 2.

TABLE 9 [Oven ageing times at 149 (3.]

Days until decompo- The coding of the additives in the same as in Examples 7-9.

Example 15 parts of polypropylene (melt index 3.2 g./ 10 mins., 230 C./2160 g.) are thoroughly mixed, in a shaking apparatus, with 0.1 part of 3-(3,5-ditert.-butyl-4-hydroxyphenyl)'-propionic acid octadecyl ester, 0 .3 part of dilauryl-thiodipropionate and an additive listed in Table V below, in the amount indicated.

The resulting mixture is kneaded for 10 minutes in a Brabender plastograph at 200 C., 1.0% by weight of powdered copper (manufactured electrolytically, Merck) is then added, and the whole is thoroughly mixed for a further 2 minutes at the same temperature. The resulting composition is subsequently pressed in a platen press, at 260 C. platen temperature, to give 1 mm. thick sheets, from which strips of 1 cm. width and 17 cm. length are punched with the aid of a punch tool.

The test for elfectiveness of the metal deactivators added to the test strips, as a function of the concentration, is eifected by heat ageing in a circulating air oven at 149 and C. The results are given in Table 10, columns 3 to 6.

TABLE 10 [Oven ageing times] Days until decomposition starts Example 16 100 parts of polypropylene (melt index 3.2 g./ 10 mins., 230 C./2l60 g.) are thoroughly mixed for 10 minutes, in a shaking apparatus, with 0.2 part of an additive listed in Table 11 below.

The mixture obtained is kneaded for 10 minutes in a Brabender plastograph at 200 C., and the composition thus obtained is subsequently pressed in a platen press, at 260 C. platen temperature, to give 1 mm. thick sheets from which strips of 1 cm. width and 17 cm. length are punched.

The test for effectiveness of the additives added to the test strips, in their capacity of antioxidants, is effected by heat ageing in a circulating air oven at 135 C. and 149 C., using an additive-free test strip for comparison. For this purpose, 3 test strips are employed of each formulation. The incipient, easily visible decomposition of the test strip is defined as the end point. The results are quoted in days.

TABLE 11 Days until decompositlon starts Stabiliser number:

Without additive l6 1 14 13 83 6 5 4 49 11 56 4 52 12 52 12 65 12 67 5 68 5 58 Example 17 The test specimens described in Example 12 were tested additionally for their colour stability, in particular:

(a) After incorporation (Table 12, column 2) (b) After 500 hours exposure to light in a Xenotest apparatus of Messrs. Hanau (Table 12, column 3) After 1 weeks treatment with boiling water (Table 12, column 4).

An empirical colour scale was used for Table 12, in which 5 denotes absence of colour, 4 denotes a just perceptible, slight discolouration, and 3, 2, 1 and 1 denote Example 18 100 parts of polypropylene (melt index 3.2 g./ mins., 230 C./2l60 g.) are thoroughly mixed for 10 minutes,

in a shaking apparatus, with 0.1 part of 3-(3,5-di-tert.-'

buty1-4-hydroxyphenyl)-propionic acid octadecyl ester (Additive A) and 0.3 part of dilauryl-thiodipropionate (Additive B) and 0.5 part ofone of the additives listed in Table 13 below.

The resulting mixture is kneaded for 10 minutes in a Brabender plastograph at 200 C., and the composition thus obtained is subsequently pressed in a platen press, at 260 C., platen temperature, to give 1 mm. thick sheets, from which strips of 1 Wi th and 17 cm. length are punched.

, The testfor etfectiveness of the additives added to the test strips, in their capacity as synergistically acting antioxidants in the presence of the Additives A and/ or B, is efiected by heat ageing in a circulating air oven at 135 C. and 149 C., using, for comparison, a test strip which only contains the Additives A and B. For this purpose, three test strips of each formulation are used. The end point is defined as the incipient, easily visible decomposition of the test strips, and the results are 10 quoted in days.

TABLE 13 Days until decomposition starts Stabilizer number:

Without additive 20 14 56 173 33 172 59 181 47 160 46 165 Example 19 g. of unstabilised high pressure polyethylene granules (Plastylene of Messrs. Ethylene Plastique, Mazingarbe, France) are thoroughly mixed, dry, with 1.0 g. of 1,3-bis-(tert.-butyl-peroxyisopropylbenzene) (Perkadox 14 of Messrs. Oxydo GmbH, Emmerich, Germany) and 0.2 g. of one of the additives of Table 14 below. The mixture is converted into a homogeneous mass over the course of 10 minutes on a friction roll mill at C. This plastics mixture is pressed in a multidaylight press at 260 C. for 20 minutes to give 1 mm. thick sheets, and under these conditions crosslinking of the polymer as a result of the peroxide added occurs. Test specimens of size 10 x mm. are punched from the sheets manufactured in this way by means of a punch tool.

The test specimens are suspended from V2A-steel stirrups and aged in a circulating air oven at 120 C. and C. After the expiration of an induction period which is characteristic of the additive, the degraded material drips away; the results are quoted in days.

TABLE 14 Days until material begins to drip away At 120 0. At 150? wherein R and R independently of one another, is hydrogen, alkyl of 1 to 18 carbon atoms, cyclohexyl, benzyl, unsubstituted phenyl or phenyl substituted by 1 or 2 alkyl groups of 1 to 8 carbon atoms each, or R% and R conjointly, with the inclusion of the nitrogen atom, is pyrrolidino, piperidino, morpholino or hexamethyleneimino radicals, and the rings A are unsubstituted or are substituted by 1 or 2 alkyl groups of 1 to 8 carbon atoms each, an alkoxy group of 1 to 18 carbon atoms or 1 to 3 chlorine atoms.

2. A compound according to Claim 1 which is 3. A compound according to Claim 1 which is NHCBHU OH OH 4. A compound according to Claim 1 which is on H Q0 0 NHNH-K LNHNH o o--@ 5. A compound according to Claim 1 which is OH N 6. A compound according to Claim 1 which is IW a m References Cited UNITED STATES PATENTS 4/1947 DAlelio et a1. 260249.6

NICHOLAS S. RIZZO, Primary Examiner JOSE T OVAR, Assistant Examiner US. Cl. X.R.

26045.8 N, 45.8 NZ, 249.6, 249.8, 249.9 

1. A COMPOUND OF THE FORMULA 